KSB 01001091 is a mechanical seal reference with the designation M7N/..-00 Q1Q1EGG. The M7N design is a single, unbalanced pusher seal with a rotating Super-Sinus spring and is independent of shaft rotation direction. The specified material combination includes sintered silicon carbide on both sealing faces (Q1/Q1), with EPDM secondary seals (E). The shaft diameter and installation dimensions must be confirmed against the pump before selecting a replacement. The corresponding KE MOTION HYDRO product reference is NV-3.